Improvement in boring-machines



y AD". MlnlcH. Bring-Machine. 168,170.. A. I l PatentedSept.28,187.5.'

I N-FI'ERS, PHOTO-LITHOGRAPHER, WASHINGTON. D C4 DANIEL M'INIcPI,z on PHILADELPHIA,

ATENT FFICE PENNSYLVANIA, AssIeNon oE oNE HALF HIS RIGHT TO OSBORN CONRAD, OF SAME PLAGE.

IMPROVEMENT IN BORING-MACHINES.

Specification forming part of Letters Patent No. 168,170, dated September 28, 1875; application filed September 5, 1874.

To all whom it may concern:

Be it known that l, DANIEL MINIGPI, o Philadelphia, yin the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement in Boring-Machines; and Ido hereby declare the following to be a full, clear, and exact description 0f the invention, such as will enable others skilled inV the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specication.

My invention has for its object the furnishing of a device for'sawing, turning, and boring.

As a saw it is particularly designed for use where circular openings are to be cut, which, ordinarily, require considerable skill and time to make perfect. This tool does away with the necessity for guiding, for the cutting is done by a saw made in the form of a segment of a cylinder, with the teeth cut on the edge, which is at right angles to the axis. This is set on van arm fixed to a revolving shaft, and, by suitable devices, is adapted to any radius which may be required, pressure upon the surface of the material to be cut being obtained from abovek by devices hereinafter explained, and the center being maintained by a pin actuated in the same manner as the pressure. As a turning-tool it has peculiar advantages also. v

Fixed to the revolving shaft is a circular cutter-head. The center is kept true and the downward pressure maintained in the same manner as in sawing. The boring facilities are the same, the auger-bit being adjusted into the recess left by the withdrawal from above of the center-pin. The combination of the three d'evices in one forms a useful and labor-saving machine, whose merits are intrinsic and very evident.

Figure 1 is a side elevation, in which A is an ordinary band, beveled, and gear-wheel. combined, which'engages with the beveled gear-wheel B, kept in gear by means of a circular dovetail groove, a, in which runs a bolt, b, with corresponding head, and which is firmly embedded in the bearing of the shaft. The shaft through which the centerand leverF. Gr is a lever, pivoted to and' bearing upon the center-pin D. H is a circular disk, fixed to and revolving with thel shaft C, on whose under side are slots, recesses, or re-enforcements for the adjustment of the cutters when they are required. In the periphery of this disk there are suitable recesses for the reception of the arm I, which is held in place by adjusting-screws. On the armI is in like manner placed the adjustable saw-clamp J, in which is set the segmental i saw. Dl represents the boring-bit, tting the recess in the center of the cutter-head H when the center-pin D is withdrawn. Fig. 2 is a view of the disk, with cutters attached, for the purpose of turning. Fig. 3 is a vertical section of the beveled gear-wheel, showing the circular dovetailed slot.

The power is applied by means of a band to the wheel A, which communicates its motion to the wheel B, which, in turn, gives a rotary motion to the shaft C, and thus the saw, cutter, or auger-bit is made to revolve. The center is fixed and maintained by means of the lever G.

The downward pressure of the saw, cutter, or auger is obtained by means of the elongated pawl and lever F, which works on a movable fulcrum in the shape of the upright rack, and which lever bears down upon the shaft by means of an eye and collar on the lever and shaft, respectively,thus always keeping the cutting-edge 0f the saw, cutter, or auger forced down upon the material to be operated upon. l

Having described my invention, I claim as new- 1. The combinationl of the rotary adjustable shaft D, head H, arm I, adjustable sawclamp J, gearing A B, rack-frame E', lever G, and rack-lever F, substantially as shown.

and described.

2. The combination7 With-the frame E', of grooved wheel B and headed bolt or pin b, bearing E, adjustable shaft D, arm l, and as and for the purpose specified.

ln testimony that I claim the foregoing I adjustable saw-clamp J, substantially as shown have hereunto set my hand this 12th day of and described.

3. The slotted cutter-head H, supporting August, 1874. Y the arm I, upon which is arranged the ad.- DANIEL MINICH.

4 instable saw-clamp J.

4. The combination, with the shaft-bearing E, sliding shaft C, and gear-Wheel A, of the Witnesses:

JNO. A. BELL, FRANK HARTMAN. 

